package com.hmall.gateway.filter;

import cn.hutool.core.text.AntPathMatcher;
import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.config.JwtProperties;
import com.hmall.gateway.utils.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;


@Component
@EnableConfigurationProperties(AuthProperties.class)
@RequiredArgsConstructor
public class AuthGlobalFilter implements GlobalFilter, Ordered {

    private final AuthProperties authProperties;
    private AntPathMatcher antPathMatcher = new AntPathMatcher();
    private final JwtTool jwtTool;

    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1、判断是否要拦截
        ServerHttpRequest request = exchange.getRequest();
        if (isExclude(request.getPath().toString())) {
            //无需拦截；直接放行
            return chain.filter(exchange);
        }

        //2 如果需要登录，获取请求头的属性，就是token
        String token = request.getHeaders().getFirst("authorization");


        try {
            // 3       校验token
            Long userId = jwtTool.parseToken(token);
    //    4.将用户信息传递到后端服务
            System.out.println(userId);

    // 将用户id设置到请求头
            exchange.mutate().request(builder -> {
                builder.header("user-info", userId.toString());
            });
        } catch (Exception e) {

            //        校验不通过
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //5、放行
        return chain.filter(exchange);
    }

    private boolean isExclude(String path) {
        for (String excludePath : authProperties.getExcludePaths()) {
            if (antPathMatcher.match(excludePath, path)) {
                return true;
            }
        }
        return false;
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
